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Debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Summary of Debt Obligations | The following table sets forth our various debt obligations:
| December 31,
| 2021 |  | 2020
2021 Promissory Note | $ | 5,220 |  |  | $ | — |
Series A Note (principal amount) | — |  |  | 2,481 |
Series B Note (principal amount) | — |  |  | 3,585 |
Paycheck Protection Program Loan | — |  |  | 2,850 |
Convertible Notes | — |  |  | 250 |
Promissory Notes | — |  |  | 905 |
Total debt | $ | 5,220 |  |  | $ | 10,071 |
Debt discount - warrants (2021 Promissory Note) | (316) |  |  | — |
Debt discount - warrants (2020 Convertible Notes) | — |  |  | (1,029) |
Debt discount - issuance costs (2020 Convertible Notes) | — |  |  | (650) |
Less: current maturities of long-term debt | (4,904) |  |  | (4,435) |
Less: long-term related-party debt | — |  |  | (195) |
Long-term debt | $ | — |  |  | $ | 3,762 |
Summary of Calculated Aggregate Fair Values and Assumptions | The following table sets forth the assumptions used and calculated aggregated fair values of the liability classified warrants:
| December 31, 2021 |  | December 31, 2020
Strike price per share | $ | 2.25 |  |  | $ | 4.00 |
Closing price per share | $ | 2.63 |  |  | $ | 1.26 |
Term (years) | 1.53 |  | 2.53
Volatility | 186 | % |  | 146 | %
Risk-free rate | 0.56 | % |  | 0.17 | %
Dividend Yield | — |  | —
Summary of Change in Fair Value of Warrant Liability | A summary of the change in fair value of the warrant liability is set forth below:
| 2021 |  | 2020
Balance, beginning of period | $ | 1,614 |  |  | $ | — |
Warrant issued | — |  |  | 2,486 |
Warrant Exercised | (16,148) |  |  | — |
Change in fair value of warrant liability | 18,139 |  |  | (872) |
Balance, end of period | $ | 3,605 |  |  | $ | 1,614 |
Summary of Interest Expense | The following table sets forth interest expense for our various debt obligations included in the consolidated statements of operations and comprehensive loss:
| Year Ended December 31,
| 2021 |  | 2020
2020 Convertible Notes | $ | 1,111 |  |  | $ | 722 |
Accretion of debt discount - issuance costs | 1,913 |  |  | 686 |
Accretion of debt discount - warrants | 1,029 |  |  | 1,457 |
2021 Promissory Note | 203 |  |  | — |
Senior Convertible Note | — |  |  | 197 |
Factoring financing agreement | 75 |  |  | 175 |
All other debt and financing obligations | 150 |  |  | 176 |
Total | $ | 4,481 |  |  | $ | 3,413 |

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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